CN111592616B - Preparation method of nanoscale hyperbranched hydrophobically associating polyacrylamide - Google Patents
Preparation method of nanoscale hyperbranched hydrophobically associating polyacrylamide Download PDFInfo
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- 229920002401 polyacrylamide Polymers 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 27
- 239000000178 monomer Substances 0.000 claims abstract description 26
- 239000003921 oil Substances 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- ACWKAVFAONSRKJ-UHFFFAOYSA-M hexadecyl-dimethyl-prop-2-enylazanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)CC=C ACWKAVFAONSRKJ-UHFFFAOYSA-M 0.000 claims abstract description 19
- MYWOJODOMFBVCB-UHFFFAOYSA-N 1,2,6-trimethylphenanthrene Chemical compound CC1=CC=C2C3=CC(C)=CC=C3C=CC2=C1C MYWOJODOMFBVCB-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 11
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 10
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002904 solvent Substances 0.000 claims abstract description 10
- 229920000642 polymer Polymers 0.000 claims abstract description 8
- 239000008096 xylene Substances 0.000 claims abstract description 8
- 229920001577 copolymer Polymers 0.000 claims abstract description 4
- 238000007334 copolymerization reaction Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims abstract description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- LWZFANDGMFTDAV-WYDSMHRWSA-N [2-[(2r,3r,4s)-3,4-dihydroxyoxolan-2-yl]-2-hydroxyethyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)OCC(O)[C@H]1OC[C@H](O)[C@H]1O LWZFANDGMFTDAV-WYDSMHRWSA-N 0.000 claims description 9
- 235000011067 sorbitan monolaureate Nutrition 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000001704 evaporation Methods 0.000 claims description 8
- 239000007800 oxidant agent Substances 0.000 claims description 8
- 229920001214 Polysorbate 60 Polymers 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 230000001590 oxidative effect Effects 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 6
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 6
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 6
- OSDWBNJEKMUWAV-UHFFFAOYSA-N Allyl chloride Chemical compound ClCC=C OSDWBNJEKMUWAV-UHFFFAOYSA-N 0.000 claims description 5
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 5
- -1 hexadecyl dimethyl tertiary amine Chemical class 0.000 claims description 5
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 5
- 229920000053 polysorbate 80 Polymers 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 150000002978 peroxides Chemical class 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 claims description 3
- 235000019441 ethanol Nutrition 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 239000003350 kerosene Substances 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium peroxydisulfate Substances [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 2
- VAZSKTXWXKYQJF-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)OOS([O-])=O VAZSKTXWXKYQJF-UHFFFAOYSA-N 0.000 claims description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229960002089 ferrous chloride Drugs 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000003502 gasoline Substances 0.000 claims description 2
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 2
- 235000006408 oxalic acid Nutrition 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- 239000012286 potassium permanganate Substances 0.000 claims description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 abstract description 3
- 238000012703 microemulsion polymerization Methods 0.000 abstract description 2
- 239000012071 phase Substances 0.000 abstract 3
- 239000008346 aqueous phase Substances 0.000 abstract 1
- 239000010779 crude oil Substances 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 6
- 239000012295 chemical reaction liquid Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 125000001165 hydrophobic group Chemical group 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000967 suction filtration Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 229920000891 common polymer Polymers 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010556 emulsion polymerization method Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000015784 hyperosmotic salinity response Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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Abstract
The invention discloses a preparation method of nanoscale hyperbranched hydrophobically associating polyacrylamide, which is characterized in that the polyacrylamide is a nanoscale hyperbranched multi-arm hydrophobically associating polymer formed by taking pentaerythritol tetraacrylate as a core and grafting acrylamide, hexadecyl dimethyl allyl ammonium chloride and 2-acrylamide-2-methylpropanesulfonic acid copolymer; the method specifically comprises the following steps: s1: preparing a hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer; s2: preparing materials; s3: preparing an aqueous phase monomer reaction solution; s4: preparing an oil phase reaction solution: dissolving pentaerythritol tetraacrylate in xylene, adding the solution into an oil phase solvent, uniformly stirring, adding an emulsifier, and magnetically stirring to obtain an oil phase reaction solution; s5: and (3) carrying out copolymerization reaction. The invention utilizes the reverse microemulsion polymerization method to prepare the nanoscale hyperbranched hydrophobically associating polyacrylamide which has excellent shear resistance, hydrophobicity and salt resistance, and simultaneously has nanoscale size, thereby improving the crude oil recovery ratio.
Description
Technical Field
The invention belongs to the technical field of synthesis of polyacrylamide, and particularly relates to a preparation method of nanoscale hyperbranched hydrophobically associated polyacrylamide.
Background
Polyacrylamide is a common polymer flooding in oil fields, and with the increasing number of petroleum exploitation in China, the consumption of polyacrylamide products in the field of oil field exploitation tends to increase greatly, but molecular chains of polyacrylamide are easy to curl under the condition of high temperature and high mineralization degree, so that the viscosity of a solution is reduced remarkably. The traditional polyacrylamide mainly aims at achieving the purpose of tackifying by improving the molecular weight of the polyacrylamide, and although the problems of temperature resistance and salt tolerance of the polyacrylamide are solved to a certain extent, the defects of poor shearing resistance and low solution viscosity are still not solved, and the tackifying effect is difficult to achieve. Therefore, the development of polyacrylamide with viscosity increasing, high temperature resistance, salt resistance and shear resistance is a trend in the future.
The hydrophobic association water-soluble polymer is an important water-soluble high-molecular polymer, which is substantially synthesized into polyacrylamide and simultaneously introduced with a small amount of hydrophobic groups, so as to obtain the hydrophobic association polyacrylamide. The molecular chain of the hydrophobic association polyacrylamide contains hydrophobic groups, so that the rheological property of the polymer can be greatly improved, meanwhile, the hydrophobic groups are aggregated due to hydrophobic effect, intermolecular association is generated, and a space network structure is formed. However, the existing hydrophobically associating polyacrylamide is of a straight chain structure, and under a high shear condition, the molecular chain structure of the polyacrylamide is unstable and is easy to break or interlace, so that the viscosity is rapidly reduced, and the polymer flooding effect is finally influenced; in addition, the fluorine-containing hydrophobic monomer modified polyacrylamide prepared by the traditional emulsion polymerization method has the problems of overlong molecular chain and overlarge size, and a large-size polymer cannot enter the deep part of a stratum and cannot be suitable for the profile control and oil displacement process of a low-permeability oil reservoir.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of nanoscale hyperbranched hydrophobically associated polyacrylamide.
The technical scheme of the invention is summarized as follows:
a preparation method of nanoscale hyperbranched hydrophobic association polyacrylamide is characterized in that the polyacrylamide is a nanoscale hyperbranched multi-arm hydrophobic association polymer formed by taking pentaerythritol tetraacrylate as a core and grafting acrylamide, hexadecyl dimethyl allyl ammonium chloride and 2-acrylamide-2-methylpropanesulfonic acid copolymer; the method specifically comprises the following steps:
s1: preparation of hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer: dissolving hexadecyl dimethyl tertiary amine and allyl chloride in absolute ethyl alcohol, heating and refluxing for 24h at 55 ℃, evaporating the ethanol solvent under reduced pressure, pouring the product of reduced pressure evaporation into acetone, freezing overnight, filtering, washing, and drying at 40 ℃ to obtain the product;
s2: preparing materials: weighing 20-25 parts of acrylamide, 2-5 parts of hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer, 1-3 parts of 2-acrylamide-2-methyl propanesulfonic acid, 0.05-0.1 part of oxidant, 30-35 parts of deionized water, 3-6 parts of pentaerythritol tetraacrylate, 10-15 parts of xylene, 70-80 parts of oil phase solvent, 20-40 parts of emulsifier and 0.05-0.1 part of reducing agent according to the following parts by mass;
s3: preparing an aqueous monomer reaction solution: adding acrylamide, a hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer, 2-acrylamide-2-methyl propanesulfonic acid and an oxidant into deionized water, and magnetically stirring to obtain a water-phase monomer reaction solution;
s4: preparing an oil phase reaction solution: dissolving pentaerythritol tetraacrylate in xylene, adding the solution into an oil phase solvent, uniformly stirring, adding an emulsifier, and magnetically stirring to obtain an oil phase reaction solution;
s5: and (3) copolymerization reaction: and adding the water-phase monomer reaction solution obtained in the step S3 into the oil-phase reaction solution obtained in the step S4, fully stirring, introducing nitrogen to drive out oxygen, adding a reducing agent to initiate polymerization reaction, controlling the reaction temperature to be 40-50 ℃, reacting for 6 hours, and purifying, washing, drying and grinding to obtain the nanoscale hyperbranched hydrophobically associating polyacrylamide.
Preferably, the dosage ratio of the hexadecyl dimethyl tertiary amine, the allyl chloride and the absolute ethyl alcohol is (3-4) g: 1 g: (6-8) mL.
Preferably, the mass ratio of the acetone to the reduced-pressure evaporation product is (5-10): 1.
preferably, the oxidizing agent is selected from one or more of ammonium persulfate, sodium persulfate, dialkyl peroxide and potassium permanganate.
Preferably, the oil phase solvent is selected from one or more of kerosene, white oil, gasoline and diesel oil.
Preferably, the emulsifier is a compound emulsifier selected from Span80/Tween80, Span20/Tween80, Span80/OP-10 and LA/Span20/Tween 60.
Preferably, the reducing agent is selected from one or more of sodium bisulfite, triethanolamine, ferrous chloride, and oxalic acid.
The invention has the beneficial effects that:
the invention firstly takes pentaerythritol tetraacrylate as a mother nucleus, takes acrylamide, hexadecyl dimethyl allyl ammonium chloride and 2-acrylamide-2-methylpropanesulfonic acid copolymer as outer arms, and utilizes a reversed-phase microemulsion polymerization method to prepare the nanoscale hyperbranched multiarm hydrophobic association polymer, thereby obviously improving the shear resistance, hydrophobicity and salt resistance of the polyacrylamide.
Drawings
FIG. 1 is a flow chart of a preparation method of nanoscale hyperbranched hydrophobically associated polyacrylamide.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
Example 1
A. Synthesis of hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer
Adding 100g of hexadecyl dimethyl tertiary amine, 30g of allyl chloride and 200mL of absolute ethyl alcohol into a three-neck flask, fully dissolving, heating to 55 ℃, heating and refluxing for 24 hours at 55 ℃, then evaporating the ethanol solvent under reduced pressure, pouring the product of reduced pressure evaporation into acetone with the mass of 8 times, freezing overnight, carrying out suction filtration and washing, and finally, placing the product of suction filtration in an oven at 40 ℃ for drying, wherein the obtained white powder is the hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer;
B. preparation of nano-scale hydrophobic association polyacrylamide
Dissolving 4.00g of pentaerythritol tetraacrylate in 15.00g of dimethylbenzene, then adding 80.00g of diesel oil, stirring uniformly, then adding an emulsifier prepared by compounding 20.00g of Span80 and 7.00g of Tween80, mixing uniformly by using a magnetic stirrer to obtain an oil phase reaction solution, then 20.00g of acrylamide, 2.00g of 2-acrylamide-2-methylpropanesulfonic acid, 4.00g of hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer, 30.00g of deionized water and 0.075g of oxidant dialkyl peroxide are prepared into water phase monomer reaction liquid, added into the obtained oil phase reaction liquid, continuously stirring, introducing nitrogen to drive off oxygen in the system, adding 1mL of reducing agent sodium bisulfite solution with the concentration of 5% (namely 0.05g of sodium bisulfite), controlling the reaction temperature at 40 ℃, reacting for 6h, purifying, washing, drying and grinding to obtain the nanoscale hyperbranched hydrophobically associating polyacrylamide.
Example 2
The difference from example 1 is that: the amount of the hydrophobic monomer of hexadecyl dimethyl allyl ammonium chloride is replaced by 2.00g from 4.00 g.
Example 3
The difference from example 1 is that: the amount of the hydrophobic monomer of hexadecyl dimethyl allyl ammonium chloride is replaced by 8.00g from 4.00 g.
Example 4
The difference from example 1 is that: the amount of pentaerythritol tetraacrylate used was changed from 4.00g to 3.00 g.
Example 5
The difference from example 1 is that: the amount of pentaerythritol tetraacrylate used was changed from 4.00g to 6.00 g.
Example 6
A. Synthesis of hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer: the same as example 1;
B. preparation of nano-scale hydrophobic association polyacrylamide
Dissolving 6.00g of pentaerythritol tetraacrylate in 15.00g of xylene, then adding 70.00g of kerosene, stirring uniformly, then adding an emulsifier prepared by compounding 15.00g of LA, 9.00g of Span20 and 6.00g of Tween60, mixing uniformly by using a magnetic stirrer to obtain an oil phase reaction solution, then 25.00g of acrylamide, 3.00g of 2-acrylamide-2-methylpropanesulfonic acid, 5.00g of hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer, 30.00g of deionized water and 0.05g of oxidant dialkyl peroxide are prepared into water phase monomer reaction liquid, and then the water phase monomer reaction liquid is added into the obtained oil phase reaction liquid, continuously stirring, introducing nitrogen to drive off oxygen in the system, adding 1mL of reducing agent sodium bisulfite solution with the concentration of 5% (namely 0.05g of sodium bisulfite), controlling the reaction temperature at 40 ℃, reacting for 6h, purifying, washing, drying and grinding to obtain the nanoscale hyperbranched hydrophobically associating polyacrylamide.
Example 7
The difference from example 6 is that: the emulsifier compounded by 15.00g of LA, 9.00g of Span20 and 6.00g of Tween60 is replaced by the emulsifier compounded by 10.00g of LA, 6.00g of Span20 and 4.00g of Tween 60.
Example 8
The difference from example 6 is that: the emulsifier compounded by 15.00g of LA, 9.00g of Span20 and 6.00g of Tween60 is replaced by the emulsifier compounded by 20.00g of LA, 12.00g of Span20 and 8.00g of Tween 60.
Comparative example 1
The difference from example 1 is that: during the preparation process, pentaerythritol tetraacrylate and xylene were not added.
Comparative example 2
The difference from example 1 is that: in the preparation process, pentaerythritol tetraacrylate, xylene and hexadecyl dimethyl allyl ammonium chloride hydrophobic monomers are not added.
The performance of the nano hyperbranched hydrophobically associating polyacrylamide prepared in examples 1 to 8 and the polyacrylamide prepared in comparative examples 1 to 2 was measured as follows:
shear resistance measurement test: respectively preparing the nanoscale hyperbranched hydrophobically associated polyacrylamide prepared in examples 1-8 and the polyacrylamide prepared in comparative examples 1-2 into 1000mg/L aqueous solutions, and measuring the apparent viscosity W of the aqueous solutions 0 Shearing with a rhine stirrer for 20s at 1 st gear, measuring apparent viscosity W after shearing, and calculating according to the formula of 100% multiplied by W/W 0 The viscosity retention was calculated.
The test structures are shown in the following table:
| 1000mg/L apparent viscosity/mPas | Viscosity retention/%) | |
| Example 1 | 63.7 | 71.5 |
| Example 2 | 58.4 | 70.9 |
| Example 3 | 67.2 | 72.2 |
| Example 4 | 61.5 | 66.4 |
| Example 5 | 69.4 | 81.6 |
| Example 6 | 72.8 | 83.3 |
| Example 7 | 71.6 | 82.9 |
| Example 8 | 73.3 | 83.1 |
| Comparative example 1 | 52.5 | 50.7 |
| Comparative example 2 | 39.7 | 46.6 |
As can be seen from the above table, the hyperbranched hydrophobically associating polyacrylamide of the present invention has high viscosity and shear resistance.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may be readily effected by those skilled in the art, and the invention is thus not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (6)
1. A preparation method of nanoscale hyperbranched hydrophobic association polyacrylamide is characterized in that the polyacrylamide is a nanoscale hyperbranched multiarm hydrophobic association polymer formed by taking pentaerythritol tetraacrylate as a core and grafting acrylamide, hexadecyl dimethyl allyl ammonium chloride and 2-acrylamide-2-methylpropanesulfonic acid copolymer; the method specifically comprises the following steps:
s1: preparation of hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer: dissolving hexadecyl dimethyl tertiary amine and allyl chloride in absolute ethyl alcohol, heating and refluxing for 24h at 55 ℃, evaporating the ethanol solvent under reduced pressure, pouring the product of reduced pressure evaporation into acetone, freezing overnight, filtering, washing, and drying at 40 ℃ to obtain the product;
s2: preparing materials: weighing 20-25 parts of acrylamide, 2-5 parts of hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer, 1-3 parts of 2-acrylamide-2-methyl propanesulfonic acid, 0.05-0.1 part of oxidant, 30-35 parts of deionized water, 3-6 parts of pentaerythritol tetraacrylate, 10-15 parts of xylene, 70-80 parts of oil phase solvent, 20-40 parts of emulsifier and 0.05-0.1 part of reducing agent according to the following parts by mass; the emulsifier is one of compound emulsifiers selected from Span80/Tween80, Span20/Tween80, Span80/OP-10 and LA/Span20/Tween 60;
s3: preparing an aqueous monomer reaction solution: adding acrylamide, a hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer, 2-acrylamide-2-methyl propanesulfonic acid and an oxidant into deionized water, and magnetically stirring to obtain a water-phase monomer reaction solution;
s4: preparing an oil phase reaction solution: dissolving pentaerythritol tetraacrylate in xylene, adding the solution into an oil phase solvent, uniformly stirring, adding an emulsifier, and magnetically stirring to obtain an oil phase reaction solution;
s5: and (3) copolymerization reaction: and adding the water-phase monomer reaction solution obtained in the step S3 into the oil-phase reaction solution obtained in the step S4, fully stirring, introducing nitrogen to drive out oxygen, adding a reducing agent to initiate polymerization reaction, controlling the reaction temperature to be 40-50 ℃, reacting for 6 hours, and purifying, washing, drying and grinding to obtain the nanoscale hyperbranched hydrophobically associating polyacrylamide.
2. The method for preparing the nanoscale hyperbranched hydrophobically associated polyacrylamide as claimed in claim 1, wherein: the dosage ratio of the hexadecyl dimethyl tertiary amine to the allyl chloride to the absolute ethyl alcohol is (3-4) g: 1 g: (6-8) mL.
3. The method for preparing the nanoscale hyperbranched hydrophobically associated polyacrylamide as claimed in claim 1, wherein: the mass ratio of the acetone to the reduced pressure evaporation product is (5-10): 1.
4. the method for preparing the nanoscale hyperbranched hydrophobically associated polyacrylamide as claimed in claim 1, wherein: the oxidant is selected from one or more of ammonium persulfate, sodium persulfate, dialkyl peroxide and potassium permanganate.
5. The method for preparing the nanoscale hyperbranched hydrophobically associated polyacrylamide as claimed in claim 1, wherein: the oil phase solvent is selected from one or more of kerosene, white oil, gasoline and diesel oil.
6. The method for preparing the nanoscale hyperbranched hydrophobically associated polyacrylamide as claimed in claim 1, wherein: the reducing agent is selected from one or more of sodium bisulfite, triethanolamine, ferrous chloride and oxalic acid.
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